My instructor tells me that the aim of the exercise is to deep stall the aircraft and prevent a wing from dropping using the rudder. Maybe the aim of the exercise is just general airmanship.
Another exercise is the stall during the turning descent. Two stages of flap, moderate bank and pull to the stall warner. Apply full power and level the wings with opposite rudder.
Then of course there is the straightforward incipient recovery.
I have troble with the rudders: I'm not much of a dancer
I don't see much value in looking at the wingtip during the stall; True you will get a good appreciation of movement about all three axes, but personally I can't help then correcting with aileron.